Why Young People's Substance Use Matters for Global HealthDuring puberty, when young people are completing their education, transitioning into employment, and forming
longer-term intimate relationships, a shift in emotional regulation and an increase in risky behaviour, including
substance use, is seen. This Series paper considers the potential eff ects of alcohol, tobacco, and illicit drug use during
this period on: social, psychological, and health outcomes in adolescence and young adulthood; role transitions, and
later health and social outcomes of regular substance use initiated in adolescence; and the off spring of young people
who use substances.